While mixing whats the important of aggregate heating and how does it effect the strength characteristics of asphalt mix.
Whats the effects if temperature varies ??
This is produced by heating the asphalt binder to decrease its viscosity, and drying the aggregate to remove moisture from it prior to mixing. ... HMA is the form of asphalt concrete most commonly used on high traffic pavements such as those on major highways, racetracks and airfields.
Pre-heating of aggregate not only ensure that there is no moisture, but it can also enhance the adhesion bond between binder and aggregate particles in which binder can easily penetrate to aggregate surface voids and make almost full contact to aggregate due to maintain in a good viscosity range to flow into small voids, while adhesion between cold aggregate and hot binder is conceivably be lower than heated aggregate.
There are multiple benefits for aggregate preheating.
1. It reduces cycle time of mixing
2. It burns foreign combustible matters available with aggregates
3. It removes moisture hence make surface voids available to accept bitumen into it.
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